package com.yidushishizijie;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

class MyCache{
    private volatile Map<String, Object> map = new HashMap<>();
    private ReadWriteLock readWriteLock = new ReentrantReadWriteLock();

    public void put(String key,Object value){

        readWriteLock.writeLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+"\t---写入数据"+key);
            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            map.put(key,value);
            System.out.println(Thread.currentThread().getName()+"\t---写入完成");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            readWriteLock.writeLock().unlock();
        }
    }
    public void get(String key){
        readWriteLock.readLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+"\t---读取数据");
            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            Object result = map.get(key);
            System.out.println(Thread.currentThread().getName()+"\t---读取完成");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            readWriteLock.readLock().unlock();
        }
    }
}

public class ReadWriteLockDemo {
    public static void main(String[] args) {
        MyCache myCache = new MyCache();
        for (int i = 0; i <=5 ; i++) {
            final int tempInt = i;
            new Thread(() ->{
                myCache.put(tempInt+"",tempInt+"");
            },String.valueOf(i)).start();
        }
        for (int i = 0; i <=5 ; i++) {
            final int tempInt = i;
            new Thread(() ->{
                myCache.get(tempInt+"");
            },String.valueOf(i)).start();
        }
    }
}
